<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="checkAll" :disabled="Todos.length==0" />
    </label>
    <span>
      <span>已完成{{ ItemDone }}</span> / 全部{{ Todos.length }}
    </span>
    <button class="btn btn-danger" @click="$emit('DeleteAll')">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "TodoFooter",
  props: {
    Todos: {},
    CheckedAll: {},
    DeleteAll:{}
  },
  computed: {
    ItemDone() {
      return this?.Todos.reduce((prev, item) => prev + item.done, 0);
    },
    checkAll: {
      get() {
        if (this.Todos.length!==0) {
          return this?.Todos.every((item) => item.done);
        }
        return false
      },
      set(val) {
        // this.CheckedAll(val);
        this.$emit("CheckedAll",val)
      },
    },
  },
};
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>